Question

Qvi) given a= 2. d=8. S. = 90. ſind n and an
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Answer 1

Answer:

$a = 2 \\ d = 8 \\ s = 90 \\ s = \frac{n}{2} 2a +( n - 1)d \\ 60 = \frac{n}{2}2 \times 2 + (n - 1)8$

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